void create_glod_object_from_vertex_buffers(S32 object, S32 group, std::vector<LLPointer <LLVertexBuffer> >& vertex_buffers)
{
glodNewGroup(group);
stop_gloderror();
glodNewObject(object, group, GLOD_DISCRETE);
stop_gloderror();
for (U32 i = 0; i < vertex_buffers.size(); ++i)
{
vertex_buffers[i]->setBuffer(LLVertexBuffer::MAP_VERTEX | LLVertexBuffer::MAP_NORMAL | LLVertexBuffer::MAP_TEXCOORD0);
U32 num_indices = vertex_buffers[i]->getNumIndices();
if (num_indices > 2)
{
glodInsertElements(object, i, GL_TRIANGLES, num_indices, GL_UNSIGNED_SHORT,
vertex_buffers[i]->getIndicesPointer(), 0, 0.f);
}
stop_gloderror();
}
glodBuildObject(object);
stop_gloderror();
}
void GLODMesh::buildObjectTrianlge( const osg::PrimitiveSet* p_set, const osg::IndexArray* p_indices )
{
GLvoid* p_indexdata = p_indices ? const_cast< GLvoid* >( p_indices->getDataPointer() ) : const_cast< GLvoid* >( p_set->getDataPointer() );
if ( !p_indexdata )
{
log_warning << "cannot create LOD, no index array available" << std::endl;
return;
}
//! FIXME: it seems that there is no simple way to determine which array data type is used in PrimitiveSet, currently we assume short
GLenum indextype = p_indices ? p_indices->getType() : GL_SHORT;
// apply the LOD settings to mesh
_p_lodSettings->apply( this );
unsigned int numindices = p_set->getNumIndices();
// enable all arrays and feed them to GLOD
glEnableClientState( GL_VERTEX_ARRAY );
osg::Array* p_verts = _p_geometry->getVertexArray();
glVertexPointer( p_verts->getDataSize(), p_verts[ 0 ].getDataType(), 0, p_verts->getDataPointer() );
osg::Array* p_normals = _p_geometry->getNormalArray();
if ( p_normals && p_normals->getNumElements() )
{
glEnableClientState( GL_NORMAL_ARRAY );
glNormalPointer( p_normals->getDataType(), 0, p_normals->getDataPointer() );
}
//! TODO: GLOD cannot handle 4 component color arrays :-(
//osg::Array* p_colors = _p_geometry->getColorArray();
//if ( p_colors && p_colors->getNumElements() )
//{
// glEnableClientState( GL_COLOR_ARRAY );
// glColorPointer( p_colors->getDataSize(), p_colors->getDataType(), 0, p_colors->getDataPointer() );
//}
osg::Array* p_texcoords0 = _p_geometry->getTexCoordArray( 0 );
if ( p_texcoords0 && p_texcoords0->getNumElements() )
{
glEnableClientState( GL_TEXTURE_COORD_ARRAY );
glTexCoordPointer( p_texcoords0->getDataSize(), p_texcoords0->getDataType(), 0, p_texcoords0->getDataPointer() );
}
glodInsertElements( _lodObjectName, _lodPatchName, GL_TRIANGLES, numindices, indextype, p_indexdata, 0, 0.0f );
// remove arrays from geometry ( they are not longer needed now ), also disable gl arrays
_p_geometry->setVertexArray( NULL );
glDisableClientState( GL_VERTEX_ARRAY );
if ( p_normals && p_normals->getNumElements() )
{
glDisableClientState( GL_NORMAL_ARRAY );
_p_geometry->setNormalArray( NULL );
}
//if ( p_colors && p_colors->getNumElements() )
//{
// glDisableClientState( GL_COLOR_ARRAY );
// _p_geometry->setColorArray( NULL );
//}
if ( p_texcoords0 && p_texcoords0->getNumElements() )
{
glDisableClientState( GL_TEXTURE_COORD_ARRAY );
_p_geometry->setTexCoordArray( 0, NULL );
}
// build lod hierarchy
glodBuildObject( _lodObjectName );
if ( glodGetError() )
log_warning << "error occured during LOD creation: " << std::endl;
++_lodPatchName;
}
